What is CVE-2021-25434?

CVE-2021-25434 is a critical-severity vulnerability in Linux Tizen, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2021-07-08.

How severe is CVE-2021-25434?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-25434 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Linux Tizen

CVE-2021-25434

Improper input validation vulnerability in Tizen bootloader prior to Firmware update JUL-2021 Release allows arbitrary code execution using param partition in wireless firmware download mode.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-07-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (75.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Linux Tizen
Samsung Mobile Tizen Wearable Devices — versions Tizen 5.5

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

References

security.samsungmobile.com/serviceWeb.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25434?: CVE-2021-25434 is a critical-severity vulnerability in Linux Tizen, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2021-07-08.
How severe is CVE-2021-25434?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-25434 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.